The invention discloses a bucket plastering connection device for an automatic plastering machine, comprising a first wheel base, a transverse pulley, a locking seat, a locking rod, a locking pad, a first supporting column, and a first supporting bottom plate , loading box, second wheel seat, roller, locking valve, discharge plate, handle of loading box, stirring and cleaning device, main pipe, discharge cover, first motor bottom plate, first motor, linkage rod, limiting hopper, Fixed base plate, feeding device, second supporting base plate, second supporting column and footing plate, etc.; the present invention has reasonable and simple structure, low production cost, convenient installation and complete functions. Automatically feed the plastering machine, which saves a lot of manpower and reduces the work intensity of the construction personnel.